Litter will be left uncollected on the streets in Derby City centre for a whole weekend in November to show people how much is dropped.
The city council's street cleaning team hope the experiment will make shoppers more aware about the rubbish they throw on the floor.
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Apart from a few outbreaks of rain in the south, it will be a dry night with patches of frost or fog forming under any cloud breaks.
Most places will be dry. Broken cloud will allow a slight ground frost to form away from coasts.